<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <link rel="stylesheet" href="./css/inputnumber.css" />
  <link rel="stylesheet" href="./css/index.css" />
  <title>购物车</title>
</head>

<body>
  <div class="app-container" id="app">
    <!-- 顶部banner -->
    <div class="banner-box"><img src="http://autumnfish.cn/static/fruit.jpg" alt="" /></div>
    <!-- 面包屑 -->
    <div class="breadcrumb">
      <span>🏠</span>
      /
      <span>购物车</span>
    </div>
    <!-- 购物车主体 -->
    <div class="main">
      <div class="table">
        <!-- 头部 -->
        <div class="thead">
          <div class="tr">
            <div class="th">选中</div>
            <div class="th th-pic">图片</div>
            <div class="th">单价</div>
            <div class="th num-th">个数</div>
            <div class="th">小计</div>
            <div class="th">操作</div>
          </div>
        </div>
        <!-- 身体 -->
        <div class="tbody">

          <!-- 渲染需要的行 -->
          <!-- 
            <div class="tr">
            <div class="td"><input type="checkbox" checked /></div>
            <div class="td"><img src="http://autumnfish.cn/static/火龙果.png" alt="" /></div>
            <div class="td">6</div>
            <div class="td">
              <div class="my-input-number">
                <button class="decrease"> - </button>
                <span class="my-input__inner">2</span>
                <button class="increase"> + </button>
              </div>
            </div>
            <div class="td">12</div>
            <div class="td"><button class="del">删除</button></div>
          </div> 
        -->

        </div>
      </div>
      <!-- 底部 -->
      <div class="bottom">
        <!-- 全选 -->
        
      </div>
    </div>
    <!-- 空车 -->
    <div class="empty">🛒空空如也</div>
  </div>
  <script>
    const dataArr = [
      {
        id: 1,
        icon: 'http://autumnfish.cn/static/火龙果.png',
        isChecked: true,
        num: 2,
        price: 6,
      },
      {
        id: 2,
        icon: 'http://autumnfish.cn/static/荔枝.png',
        isChecked: false,
        num: 7,
        price: 20,
      },
      {
        id: 3,
        icon: 'http://autumnfish.cn/static/榴莲.png',
        isChecked: false,
        num: 3,
        price: 40,
      },
      {
        id: 4,
        icon: 'http://autumnfish.cn/static/鸭梨.png',
        isChecked: true,
        num: 10,
        price: 3,
      },
      {
        id: 5,
        icon: 'http://autumnfish.cn/static/樱桃.png',
        isChecked: false,
        num: 20,
        price: 34,
      },
    ]
    render()
      // 页面渲染入口
      function render(){
        tbodySet()
        bottom()
      }

      // 内容渲染
      function tbodySet(){
        const arr=dataArr.map(item=>{
          const {id,icon,isChecked,num,price}=item
          return `
          <div class="tr">
            <div class="td"><input onclick='clickgoods(${id})' type="checkbox" ${isChecked ? 'checked':''} /></div>
            <div class="td"><img src=${icon} alt="" /></div>
            <div class="td">${price}</div>
            <div class="td">
              <div class="my-input-number">
                <button onclick='setnum(${id},"-")' class="decrease"> - </button>
                <span class="my-input__inner">${num}</span>
                <button onclick='setnum(${id},"+")' class="increase"> + </button>
              </div>
            </div>
            <div class="td">${price*num}</div>
            <div class="td"><button class="del" onclick='del(${id})'>删除</button></div>
          </div> 
          `
        }).join('')
        document.querySelector('.tbody').innerHTML=arr
      }
      

      // 底部渲染
      function bottom(){
        const bottom=`
        <label class="check-all">
          <input ${allChecked() ? 'checked' : ''} onclick='allCheckeds()' type="checkbox"/>
          全选
        </label>
        <div class="right-box">
          <!-- 所有商品总价 -->
          <span class="price-box">总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price">${allPrice()}</span></span>
          <!-- 结算按钮 -->
          <button class="pay">结算(${allCount()} )</button>
        </div>
        `
        document.querySelector('.bottom').innerHTML=bottom
      }
      // 计算全选
      function allChecked(){
        return dataArr.every(item=>item.isChecked)
      }

      // 更新全选
      function allCheckeds(){
        const checkedbtn=document.querySelector('.check-all input')
        dataArr.forEach(item=>(item.isChecked=checkedbtn.checked)
        )
        render()
      }

        // 点击商品改变状态
        function clickgoods(id){
        const find =dataArr.find(item=>item.id===id)
        find.isChecked=!find.isChecked
        render()
      }

      // 计算总价
      function allPrice(){
        return dataArr.reduce((sum,item)=>{
        return item.isChecked? sum+item.num*item.price :sum},0)
      }

      // 计算总数
      function allCount(){
        return dataArr.reduce((sum,item)=>{
          return item.isChecked ? sum+item.num :sum
        },0)
      }

      // 点击加减
      function setnum(id,opt){
        const find=dataArr.find(item=>item.id===id)
        if(opt==='-'){
          find.num--
          if(find.num<1){
            find.num=1
          }
        }else{
          find.num++
        }
        render()
      }

      // 删除功能
      function del(id){
        const index=dataArr.findIndex(item=>item.id===id)
        dataArr.splice(index,1)
        render()
      }
  </script>
</body>

</html>